Twin City BCRFS Belt Driven Centrifugal Filtered Supply Fans - IM-4310 - Manual (Page 5)

Twin City IM-4310 5
Maintenance
Installation and maintenance are to be performed only
by qualified personnel who are familiar with local codes
and regulations and experienced with this type of equip-
ment.
CAUTION: Sharp edges and screws are a potential injury
hazard. Avoid them.
WARNING
Hazardous moving parts. Unit may contain pro-
tected fan motor which may start automatically
and cause injury. Allow time for reset.
Disconnect power before servicing.
Preventive maintenance is the best way to avoid unneces-
sary expense and inconvenience. Start-up and routine
maintenance should cover the following items:
a. Tighten all setscrews, bolts and wire connections.
b. Check belt tension and sheaves for wear.
c. Lubricate fan bearings (see Tables 1 and 2).
d. Cleaning of unit, wheel and filters.
All motors containing ball bearings are permanently lubri-
cated from the factory. No additional maintenance is
required.
1. Before performing any maintenance on the fan, be
sure power is turned off and locked in the OFF posi-
tion at the service entrance.
2. Fans should be carefully checked at least once a year.
For critical or rugged applications, a routine check
every two or three months is suggested.
3. All motors supplied with Twin City Fan & Blower units
carry a one-year limited warranty from date of ship-
ment. For repairs within the warranty period, the motor
must be taken to the motor manufacturer’s authorized
service dealer. Contact your representative for addi-
tional warranty details.
4. A periodic motor check should consist of spinning the
motor shaft with the power off to be sure the motor
turns freely and the bearings run smoothly. The belt
on belt driven units should be removed from the motor
sheave.
5. When removing or installing a belt, do not force the
belt over the sheave. Loosen the motor mount so that
the belt can be easily slipped over the sheave.
6. The belt on belt driven units should be removed and
carefully checked for glazing, cracks, ply separation or
irregular wear. A small irregularity in the contact sur-
face of the belt will result in noisy operation. If any of
these defects are apparent, the belt should be
replaced. Check the sheaves also for chipping, dents
or rough surfaces which could damage the belt.
7. The correct belt tension is important. Too tight of a
belt will result in excess pressure on the motor bear-
ings and fan bearings and may also overload the
motor. Too loose of a belt will result in slippage which
will quickly “burn” out belts. A belt should feel “live”
when thumped, approximately 1 ⁄
4
" belt deflection (3 to
5 lb.) when subject to finger pressure at midpoint
between sheaves.
Table 1. Suggested Fan Bearing Greasing Intervals
Table 2. Grease Manufacturers
MANUFACTURER GREASE (NLGI #2)
Shell Gadus S2 V100 2
Exxon/Mobil Ronex MP
8. The belt alignment should also be checked to be sure
the belt is running perpendicularly to the rotating
shafts. Fan and motor shafts must be parallel.
Improper alignment will result in excessive belt wear.
9. Check sheave setscrews to ensure tightness. Proper
keys must be in keyways.
10. Do not readjust fan RPM. If sheaves are replaced, use
only sheaves of identical size and type.
11. If unit is to be left idle for an extended period, it is
recommended that belts be removed and stored in a
cool, dry place to avoid premature belt failure.
12. Fan bearings on sizes 090 - 180 are permanently lubri-
cated. The standard pillow block bearings on sizes 200
and 220 are factory lubricated and are provided with
grease fittings. Annual relubrication is recommended, or
more frequently if needed (see Table 1).
Do not over-grease. Use only 2 or 3 shots of a
recommended lubricant with a hand gun in most
cases (see Table 2). Maximum hand gun rating 40
P.S.I. Rotate bearings during lubrication where good
safety practice permits.
CAUTION: Greases of different soap bases (lithium,
sodium, etc.) may not be compatible when mixed.
Prevent such intermixing by completely purging the
bearing of old greases.
The most frequent causes of bearing failure are not
greasing often enough, using an excessive quantity of
grease, or using incompatible greases. Excessive
vibration, especially if the bearing is not rotating, will
also cause bearings to fail. Bearings must also be
protected from water and moisture to avoid internal
corrosion.
13. During the first few months of operation it is recom-
mended that the bearing setscrews be checked peri-
odically to ensure that they are tight.
14. The rotating wheel requires particular attention since
materials in the air being handled can build up on the
blades to cause destructive vibration or weaken the
structure of the wheel by corroding and/or eroding the
blade metal. Regular inspection and corrective action
at intervals determined by the severity of each applica-
tion are essential to good service life and safety.
FILTER MAINTENANCE
Filters should be inspected and cleaned regularly, as dirty
filters will cause fan performance to be reduced. Remove
wing nuts and bolts from one side of the hood. Tilt filters
forward and remove from the top. Filters should be cleaned
with a mild detergent in warm water.
INTERVAL
(MONTHS)
TYPE OF SERVICE
12 to 18 Infrequent operation or light duty in clean atmosphere.
6 to 12 8 to 16 hrs./day in clean, relatively dry atmosphere.
3 to 6 12 to 24 hrs./day, heavy duty, or if moisture is present.
1 to 3
Heavy duty in dirty, dusty locations; high ambient
temperatures; moisture laden atmosphere; vibration.